110 FOSSIL FLORA OF THE JOHN DAY BASIN, OREGON. [bull. 204. 



which I have considered as too indefinite to be entitled to recognition, 

 and Paliurus cohmihl has been referred to Grew'ia erenata. The 

 examples representing these species at Ellensburg are more numer- 

 ous and better preserved, and are probably correctly determined. 

 Salix varians, which is represented at Van Horn's ranch by a very 

 few examples, is extremel}^ abundant at Ellensburg, and I have also 

 recognized in this material one of the new species of Salix {S. jpseudo- 

 argentea) from the Mascall beds. A number of the Ellensburg species 

 are also common to the Auriferous gravels of California. 



As I pointed out in the report on the Ellensburg material, there can 

 be no doubt that it is of the same age as that at Van Horn's ranch, a 

 condition further emphasized b}^ the similarit}' in the matrix, that from 

 both localities being a white, soft, fine-grained volcanic ash. 



In 1892 Mr. J. S. Diller made a small collection of fossil plants at 

 a point 6 miles southeast of Ellensburg, Washington, that contains, 

 among other species, some well-preserved examples of Platanus dis- 

 jecta. The matrix is also similar to that at Ellensburg and Van Horn's 

 ranch, and the age of the beds is undoubtedly the same. 



In 1898 1 published a report" on the Fossil Plants of the Payette 

 Formation. The name Payette formation was given b}^ Mr. Walde- 

 mar Lindgren to a series of lake beds along the Snake River, in 

 western Idaho. The flora here enumerated embraced 32 forms, of 

 which number 17 were described as new and 5 were not specifically 

 named, leaving, as then known, onh^ 10 species having an outside dis- 

 tribution. On page 736 of this report I gave a table showing the 

 extralimital distribution of these 10 species. On referring to this 

 table it will be seen that 5 of these species are found only in the beds 

 at Bridge Creek, and to this list I am now able to add another species 

 {Sequoia angustifoUa)., thus making 6 of the 10 species common to these 

 two localities. A number of forms that I described as new are 

 undoubtedly related to Bridge Creek species. Thus Quercus simidata 

 is related to Q. simplex, and Q. idahoensis and Q. payettensis are 

 both more or less closely related to Q. consimilis. Two species 

 {Jitglans Tiesperia, which I have now referred to J. oregoniana Lesq. , 

 and Populus Lindgreni)., described as new in the Pa3^ette formation, 

 have been detected in the Mascall beds at Van Horn's ranch. 



In this report the Payette formation was referred to the Upper 

 Miocene, but I was misled b}' the knowledge then current regarding 

 the position of the Bridge Creek beds, as I have already pointed out, 

 and it is now necessary to change that reference. The flora of the 

 Payette formation undoubtedly finds its greatest affinity with that at 

 Bridge Creek, a fact recognized all along, and, like it, is now referred 



aEigbteenth Ann. Kept U. S. Geol. Survey, I't. HI, pp. 721-744; Pis. XCIX-CII. 



